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The 1X2  (European: DY80) (P/N 154-0005-00) is a high-voltage rectifier vacuum tube with a B9A (Noval) miniature 9-pin base and an anode cap.

Its maximum inverse voltage is 15 kV and the maximum forward current is 1 mA. The filament operates on 1.25 V, 200 mA.

Used in

The 1X2 tube is used in the 565, 507, and 517 (420 HV supply).

Aged/Checked/Matched Pair Details
Used in Tek Part# S/N Range
420, 420A 157-0079-00 All, Note 1

Note 1: A dot of yellow lacquer is applied to bottom of the selected tube.


Tube aging procedure / Selection and checking procedure

Some instruments using part 1X2

Instrument Manufacturer Class Model Description Introduced
420 Tektronix Power supply 420 high-voltage power supply 1950
507 Tektronix Oscilloscope 507 Power Industry scope 1959
565 Tektronix Oscilloscope 565 10 MHz dual-beam scope 1962